Black Diamond Mines Regional Preserve

East Bay Regional Parks is having an open house April 5-6 for the silica/sand mine tours at Black Diamond Mines Regional Park, where you’ll be able to go 810 feet into the mine rather than a mere 400, which was…

One of my rules is: always visit the graveyard. There used to be as many as seven coal mines in these hills near Antioch in northeastern Contra Costa County. The towns that sprouted up around these mines are long gone…